"Pete C" wrote

Hi,

If plywood is not enough then a layer of intumescent paint or coating
will give more fire resistance.

cheers,
Pete.

Pete,

I have heard of those paints and they would probably help - But are they
readily available at Home Depot etc?

My current icebox, has no plywood over the insulation. All it has, is a thin
layer of glass and resin that encapsulates the foam. Many boats are like
this.

Seems strange that when modifying boat, we go to lengths to solve problems
that the original builders ignored!

Plan is to use 3/8" or 1/2" plywood just to protect the insulation from
physical damage. If it helps stops a potential fire, so much the better!
But, by that time, the rest of the boat will likely already be on fire.

GBM